At the end of the film, Kirk is slowly regaining consciousness. During this scene, some audio from Star Trek (2009) plays. It's from the opening sequence of that film, when his parents were discussing naming him. You hear both Chris Hemsworth's and Jennifer Morrison's voices, and so that's why they're credited.

No, it doesn't make sense that he'd be hearing this, he was just born in that scene, so he couldn't possibly remember this.